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Love x Holic: Miwaku no Otome to Hakudaku Kankei - The Animation

ラブホリック ~魅惑の乙女と白濁カンケイ~ THE ANIMATION

Based on the erotic game by Atelier Kaguya Bare & Bunny. In a world where humans and demi-humans coexist, Taichi Amano has by accident drank some blood of Kuon Aoe, the most popular girl in the school. Drinking her blood changed his body to have a special constitution which awakens demi-humans. In exchange for protecting Taichi from whoever would target him, the Aoe house made him cooperate with awakening Kuon... (Source: VNDB)